Valve



Jan. 17, 1933. N. B. SIMPSON VALVE Original Filed Oct. 26. 1929 O m W W.

4f NAPOLEON B. SIMPSON.

A ORNEY NAPOLEON B. smrson, or SAN FRANCISCO, CALIFOR IA, ASSIGNOR 'ro SIMPSON MOTOR,

Patented in... 17, 1933 UNITED STATES PATENT OFFICE CORPORATION, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA VALVE.

Application filed October 26, 1929, Serial No. 402,684. Renewed July 5, 1932.

My invention relates to valves, especially to engine valves and particularly to valves for internal combustion engines. My invention is especially applicable to and vwillbe described as embodied in a valve, of oscillating rotary type, which slides upon its seat.

The present invention is an improvement upon my prior Patent Number 1,075,163 of October 7, 1913. Its objects are to provide means for taking up clearancecaused by wear or regrinding of the valve, to compensate for slight inaccuracies in its constructlon or heat-distortion in its operation, and to maintain a most effective seal against valve leakage without undue pressure or frictlon between valve and seat. It is further an object of my invention to provide adjustability in a valve vof the type describedin my said prior patent, to provide thatad-justability simply and economically, and to provide an adjusting {means which will best withstand the conditions ofservice to which such valves are exposed. It is an object of my invention to provide a valve which may readily and simply be adjusted without requiring any substantial disassembly of the valve or of the engine to which it is applied. It is a further object of my invention to provide a valve which will slide across'its 'port' without clicking, chattering, binding; gouging, or jamming. It is an object ofmyv 1n- ,vention to provide a valve with compensating means for resolving Slight inaccuracies in construction or assembly, or expansion, distortion or wear in service. My invention aims to. provide a generally improved structure in both detail and assembly, for the uses and purposesset forth. Other and ancillary objects of my invention will be suggestedin metry, and is indicated by a line 2 2 in Fig. 1. j v V Figure 3 is a bottom plan detail of the valve closure member.

Fig. 4 is a fragmentary face view of th valve port Showing the valve almost, but not quite closed. I The valve assembly of my invention consists essentially of a housing member 2, a valve closure member 4, a valve shaft memencloses a valve chamber of generally segmental cylindrical shape bored to an accurate segmental cylindrical valve seating surface 2a.

A rectangular valve port 26 leading from the housing,.is bounded by the valve seat 2a.

The valve closure member 4 is arranged to slide back and forth circumferentially of the valve seat to open and close the port 26. The face portion 4a of the valve closure member is an annular segment large enough to cover the port 2?) and having its outeror face surface finished accurately to the same radius of curvature as the seat-2a.

A valve stem is constituted by a tall integral radially directed longitudinal rib 4?) on theconcave side of the closure member. This stem acts as a key in transmitting rotation ,from'the valve shaft to the closure member;

its-broad sidepfaces being planed parallel to fit a driving slot of the valve shaft member next to be described. Y

a The valve shaft member 6 is a generally circular shaft journaled in the housing 2 exactly in line with the axis of its cylindrical surface 2a. As in myprior Patent 1,075,163, antifriction bearings (not shown herein) for the shaft are preferably provided in the. housing. A radially directed longitudinal driving slot is formed in the shaft to receivethe valve stem 4?; with a close sliding fit. The faces of the slot are heightened and reinforced by longitudinal shoulders 6a, 6a, projecting up from the otherwise circular shaft on either side of the slot. The stem 46 is constrained member 8 is a taper pin with small diameter and large diameter ends untapered fora distance suflicient to guide axial movementof the pin, and with its large diameter end threaded; A'screw-driver slot 8a is formed across the large diameter end of the pin. The,

adjusting pin 8 is intended to extend and be adjustable axially within the shaft 6,21I1dl30.

that end, the shaft is drilled axially throughout a major portion of its length to fit the of the pin.

"between.

large end of the adjusting pin, and to a slight- 1y greater depth to'fit' the small end of the adjusting pin. The outer end 'ofthe hole is tapped to take the threaded end of the pin 8, and both diameter'iportions ofthe hole are suificiently long to permit axial adjustment W henassembleohthe end of the valve stem projects down 1 into the hollow part of the shaft andbears against thetapered'portion of the adjusting pin 8 therein. When the adjusting pin is retracted to present a smallerdiameter portion; of its taper surface to the stemend, the valve-closure member 4- is free to move away from its seat; and conversely when the adjusting pin is screwed further into "the shaft-the closure member is forced against its seat to take up clearancethere- A keyway 6b is shown near the of the shaft 6 to accommodate a suitable driving connection for oscillating the shaft. The

'keyway 6b is preferably formed at the threaded portion of the shaft so that the driving key therefor may enter the slot 8a in the pin 8 to perform the added function of locking-the pin in adjusted position.

The valve stem 415, instead of pre'senting'a plane bearing surface against the'pin 8, has

its bearing'en'd 40 curved longitudinally to form a rocker. The valve is thereby enabled to adapt itself pivo-tally" at right angles to its direction of oscillation.

the axis of the valve shaft and being free 'to 6"able connection betweenthe valve shaft and member to adapt itself to irregularities such face. The planes of the slits are parallel to each other and to the axis of the shaft 6 are spaced from each other in a direction .7 radial to that axis, and the slits are stag- 'gered in a direction longitudinally of it. 1

The staggered slits allow the valve to bear It will be ob served'that the valve is in effect mounted upon a universal joint; being driven about I against its seat in spite of slight inaccuracies The slits allow for expansion due slides across, the port in closing there might be a tendency for the leadinggedgeof its face (in the direction of' closing) to catch on the closing or last-covered port edge of the seat, and especially so in event of warping. or other slight imperfection of the valve assembly. In my improved valve'that liability is avoided'(see Fig. 12) by forming the edge 4; of the valve at a slight angle to the edge 20 0f the port, orinmore technical language,-by forming the leading linear. face edge if of the closure member face def-on a slight slant relative to the-linearportclosing edge 20 of the valveseati surface; so that as the valve closes, these: two edges will gradually slide by each other as'two intersecting lines instead of meeting squarely as two parallel lines. f1, It will be noted that the valve seat proj ects slightly above the surface of the valve chamber, and its extent is such that the valve never overrides its seat, i. e.', the seat is carried just to the limits of motion ofthe valve.

Thus a tendency for the valveto w'ear a groove intothe seat, or of the seat to wear a grooveinto the-valve, is avoided; v V V Means are provided for supplying the valve with a sealing and lubricating" film of oil. As the valve -"slides back andi' forth aroundits seat a long narrow segment of the seatadjacent to the port is never uncovered by the valve face. An oil groove 203 'is formed along that segment in the seat. An oil pipe 10 leads to-the groove 2d and may be supplied with lubricant from thepressure lubricating system of the engine or by other suitable means.

i I- h'ave described one embodiment of invention in detaihbut it is emphasized that this embodiment is illustrative and not in- -clusive'of all the forms my invention 'may 1115 assume. Certain of the objects or certain portions or combinations of the objects of my invention may be attained with the use of less than all its advantageous features or with modifications within its purview. It

is petitioned that my invention be limited only by the claims constituting its final determination.

I claim:

1. In combination, a valve. seat, an oscillating valve,bear1ng' means for reslstmgmo tion of the valve from saidrseat, and positive adjusting means between said valve and bears ing for adjusting said valve toward said seat.

2. In a rotary valve, a hollow shaft, a valve closure member keyed to said shaft, and

within said shaft and means for moving said taper pin axially of the shaft.

3. A hollow drive shaft having a driving keyway therein, and an adjusting screw within said shaft having a transverse cut formed therein adjacent to said keyway, whereby said adjusting screw can be locked and said shaft driven by a single key in said keyway.

4. A valve assembly comprising a housing having a segmental cylindrical seat, a shaft journaled axially of the seat in said housing, a valve closure member mounted for rotation with said shaft and having a valve face in arcuate sliding contact with said seat; said closure member being free to rock longitudinally on said shaft whereby to compensate for possible inaccuracies of shaft alignment and the like, adjusting means for moving said closure member generally radially of said shaft, and yieldable means between said closure member and shaft to compensate for possible slight inaccuracies of adjustment and alignment of the closure member.

5. In combination, a rotary valve, means for rotating said valve about its axis, and means providing a pivotal support for the valve to permit the latter to rock in the plane of its axis to accommodate the valve to its seat.

6. In combination, a valve seat having a port therein, a valve'slidable upon'sai'd seat to open and close said port, and positive adjusting means for moving said valve toward said seat to take up clearance therebetween.

7. In combination, a valve seat having a port therein, a valve slidable upon said seat to open and close said port, yieldable means for preventing jamming between said valve and seat, and adjusting means for moving said valve toward said seat to take up clearance therebetween; said adjusting means being distinct from said yieldable means.

8. In combination, a valve seat having a port therein, a valve slidable on said seat to open and close said port, resilient means for preventlng amming between sald valve and seat and ad ustlng means for compressing stantially parallel to said seat, a valve carried by the shaft and engageable with the seat, and a rocker connection between the shaft and valve to compensate for any disalignment between the shaft and the valve seat.

12. In a valve structure of the character described, a housing having a valve seat, a hollow shaft in said housing having a slot, a valve engageable with the seat, a web on said valve projecting into the slotted portion of the shaft, said web being rounded to 7 form a rocker support for the valve, and adjustable means within the shaft forming a support for the rocker and also adapted to move the valve radially with relation to the shaftinto engagement with the valve seat.

NAPOLEON B. SIMPSON;

said yieldable means toforce saidvalve V against said seat.

9. In combination, a valve seat having a port therein, a valve slidable upon said seat to open and close said port, positive adjusting means for moving said valve toward said seat, and yieldable means for preventing jamming between said valve and seat.

10. A valve structure comprising a shaft, means for rotating the shaft about its axis,

7 and a valve carried by the shaft and having a rocker support with relation to the shaft to compensate for any disalignment between the shaft and the'valve seat.

11. In combination, a valve seat having a port formed therein, a shaft journaled sub- 

